Flex TPO Для дома - Manual (Page 31)

Cut a test sample across the width of the seam at least 1” wide and
longer than the width of the seam.
Pull the welded seam sample apart and examine the width of the
delamination from the reinforcing fabric. The width of the weld should
be no less than 1.5” indicating a proper hot air welded seam.
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Automatic hot air welder allows workers to operate upright,
which is more comfortable and much faster.